Photographic-printing frame



G. W. 000K. PHOTOGRAPHIO PRINTING FRAME.

Patented May 12, 1863.

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UNITED STATES GEORGE W. COOK, OF ST. PAUL, MINNESOTA.

PHOTOGRAPHIC-PRINTING FRAME.

. Specification forming part of Letters Patent No. 38,468, dated May 12,1863.

.To all whom it-may concern.-

Be it known that I, GEORGE W. 000K, of St. Paul, in the county of Ramsey and State of Minnesota, have invented a new and use ful Improvement on PhotograpbiePrinting Frames, which shall be known and designated as The Whitney Photographic-Printing Frame; and I do hereby declare that the following is a full and exactdescription ther'eof, reference being had to the accompanying and to the letters of reference marked thereon.

The nature of my invention cdnsists in atta-ching to the cover or lids of photographicprinting frames, four spring-bolts which readi- 'ly adjust themselves to the different thicknesses of photographic negatives, and at the same time give the desired pressure, avoiding all liability of breaking the glass plate or moving: the impression while being examined in the process of printing, and which can be operated with rapidity and perfect case.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

The accompanying drawing is an isometrical view of the frame and the improvement thereon.

I make my frame with cover or lids in the ordinary manner, as shown at A and B B, the lids being hinged together. On the top o t each of these lids I place two spring-bolts, U G (l G, which operate in connection and against each other endwise by means of a spring placed between the two, as shown at G G. I make two slots in each of these'bolts, as shown at D D, to receive the screws, by which means they are attached to the lids and allowed to work to and from each other. I make the knob or handle of the bolts 1 I concave on the side at which the fin 1 is applied, 'forease and security in handling. I make four slots or apertures in the frame A, as shown at H H, ofsufficientlength and depth to receive the bolts 0 G (l (l, and at a proper height from the bottom of the frame to admit of photographic negatives, papers, 820., of different thicknesses being placed beneath the lids or cover and still give a bearing on each of the bolts, as shown at E. I round ott'or bevel the outer edge of the lids B B, either the full length or directly under the bolts, as shown at F F, for the purpose of allowing the bolts to spring at that point. I bevel the top edge of the slots H H to correspond with the incline of that part of the bolt which has its bearing in the slot. 1 make these bolts of any metallic or other substance having the'necessary strength and elasticity. I place between these bolts any kind of springs desirable which are in common use. In operating a press or frame thus arranged, you have only to clasp between the thumb and forefinger the two knobs or handle of the bolts and press them together; the bolts are instantly removed from their bearings, and at-thesametimeholding them between the thumb and finger, the cover or lid is removed or turned down, the operation being simple, easy, and expeditious.

What I claim as new, and desire to secure by Letters Patent, is-

The construction and arrangement of the four bolts 0 (J (l U, in combination with the springs G G, and the frame A, and the lids B B, substantially as shown and described.

GEORGE W. COOK.

Witnesses J. HILL, 7 J. E. WHITNEY. 

